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Why?

When can poeple look up my screen name and see all my post. Espically the ones that are in private groups.
How can I change it so nobody can see. My profile is already blocked but I don't like that someone can key in my name and and see my stuff.

Nobody should be able to see your posts in a private group, as long as the owner or admin has set every individual forum and area of the group to private. Then only members can see.
We can search your screen name and see your answers in the Answers section, but you can answer anonymously if you don't like that. Or stay out of the Answers sections.
You can also write Journals and set those to Friends Only as well.
There are ways to help protect your privacy to a certain extend.